The current study involves the synthesis of xNa2O·20PbO·(25-x)Bi2O3·55B2O3 glass system (with 5 ≤ x ≤ 25 mol%) by melt quench technique to analyze the influence of Na2O on the structural, optical, and dielectric properties of glass samples. X-ray diffraction (XRD) confirmed the amorphous nature of the samples while scanning electron microscopy (SEM) verified glass formation through morphological analysis. FTIR and Raman spectra analysis suggests that B2O3 exists mainly as [BO4] and [BO3] structural units. PbO and Bi2O3 act as network-modifying [PbO4] and [BiO6] octahedral units accordingly. The indirect optical band gap increases with the gradual substitution of Bi2O3 by Na2O content. The synthesized glasses exhibit high electronic oxide ion polarizability (3.253–2.867), optical basicity (1.156–1.087), and metallization criterion values (0.329–0.370), indicating their suitability for non-linear optical devices. The dielectric study revealed non-Debye type behavior in the synthesized glasses.
{"title":"Structural, optical, and dielectric investigations of sodium-modified lead-bismuth borate glasses","authors":"Divya Yadav , Rajni Bala , Sumit Chauhan , Sanjay Gaur , Deepesh Sharma , Saroj Rani","doi":"10.1016/j.optmat.2024.116573","DOIUrl":"10.1016/j.optmat.2024.116573","url":null,"abstract":"<div><div>The current study involves the synthesis of xNa<sub>2</sub>O·20PbO·(25-x)Bi<sub>2</sub>O<sub>3</sub>·55B<sub>2</sub>O<sub>3</sub> glass system (with 5 ≤ x ≤ 25 mol%) by melt quench technique to analyze the influence of Na<sub>2</sub>O on the structural, optical, and dielectric properties of glass samples. X-ray diffraction (XRD) confirmed the amorphous nature of the samples while scanning electron microscopy (SEM) verified glass formation through morphological analysis. FTIR and Raman spectra analysis suggests that B<sub>2</sub>O<sub>3</sub> exists mainly as [BO<sub>4</sub>] and [BO<sub>3</sub>] structural units. PbO and Bi<sub>2</sub>O<sub>3</sub> act as network-modifying [PbO<sub>4</sub>] and [BiO<sub>6</sub>] octahedral units accordingly. The indirect optical band gap increases with the gradual substitution of Bi<sub>2</sub>O<sub>3</sub> by Na<sub>2</sub>O content. The synthesized glasses exhibit high electronic oxide ion polarizability (3.253–2.867), optical basicity (1.156–1.087), and metallization criterion values (0.329–0.370), indicating their suitability for non-linear optical devices. The dielectric study revealed non-Debye type behavior in the synthesized glasses.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116573"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116513
Ting-Hsuan Chuang , Kuan-Yu Su , Yu-Ru Yang , Yi-Ting Chen , Ching-Yung Hsu , Zih-Ru He , Chin-Wei Lu , Chih-Hao Chang
The host material plays a pivotal role in the performance of organic light-emitting diodes (OLEDs), driving efficient energy transfer to the guest material and thereby boosting overall device efficiency. Among the promising candidates for host materials, exciplexes stand out for their ability to fine-tune charge transport and facilitate superior energy transfer. In this study, we introduce diphenylquinoxaline (DPQ) as the core framework for the electron acceptor, leading to the creation of two innovative designs: DPQ-1 and DPQ-2. To complement this, carbazole and phenothiazine derivatives—renowned for their excellent hole-transport properties—were selected as electron donors. The interplay between these components fosters the formation of exciplexes, meticulously optimized through tailored molecular configurations. Incorporating tert-butyl groups further enhances solubility and mitigates quenching caused by molecular aggregation. By pairing the DPQ acceptor with various electron donors, we unraveled the mechanism behind exciplex formation. The DPQ molecules, along with donor-acceptor blends, were then employed as hosts in OLED emitting layers to evaluate their performance. Notably, red phosphorescent OLEDs using DPQ-2/TCTA achieved an impressive maximum external quantum efficiency (EQE) of 11.7 %, while the DPQ-2/mCP blend reached an even higher EQE of 12.6 %. These results underscore the significant potential of DPQ-based systems in advancing electroluminescent technologies.
{"title":"Quinoxaline-based host materials for organic light-emitting diodes","authors":"Ting-Hsuan Chuang , Kuan-Yu Su , Yu-Ru Yang , Yi-Ting Chen , Ching-Yung Hsu , Zih-Ru He , Chin-Wei Lu , Chih-Hao Chang","doi":"10.1016/j.optmat.2024.116513","DOIUrl":"10.1016/j.optmat.2024.116513","url":null,"abstract":"<div><div>The host material plays a pivotal role in the performance of organic light-emitting diodes (OLEDs), driving efficient energy transfer to the guest material and thereby boosting overall device efficiency. Among the promising candidates for host materials, exciplexes stand out for their ability to fine-tune charge transport and facilitate superior energy transfer. In this study, we introduce diphenylquinoxaline (DPQ) as the core framework for the electron acceptor, leading to the creation of two innovative designs: <strong>DPQ-1</strong> and <strong>DPQ-2</strong>. To complement this, carbazole and phenothiazine derivatives—renowned for their excellent hole-transport properties—were selected as electron donors. The interplay between these components fosters the formation of exciplexes, meticulously optimized through tailored molecular configurations. Incorporating <em>tert</em>-butyl groups further enhances solubility and mitigates quenching caused by molecular aggregation. By pairing the DPQ acceptor with various electron donors, we unraveled the mechanism behind exciplex formation. The DPQ molecules, along with donor-acceptor blends, were then employed as hosts in OLED emitting layers to evaluate their performance. Notably, red phosphorescent OLEDs using <strong>DPQ-2</strong>/<strong>TCTA</strong> achieved an impressive maximum external quantum efficiency (EQE) of 11.7 %, while the <strong>DPQ-2</strong>/<strong>mCP</strong> blend reached an even higher EQE of 12.6 %. These results underscore the significant potential of DPQ-based systems in advancing electroluminescent technologies.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116513"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116532
S. Abima, S. Sumathi
This paper investigates the novel series of Near-infrared (NIR) reflective pigments with the general formula Gd1-xBix(P1-yVyO4) prepared via the facile hydrothermal method [where, x = y = 0, 0.05, 0.1, 0.2, and 0.5]. The synthesized compounds were examined by XRD, XPS, FTIR, UV–Vis DRS, SEM and TEM characterization techniques. Bismuth, vanadium co-doping in GdPO4 host lattice unaltered the phase structure up to x = y = 0.1. At higher co-dopant concentrations, the distortion in the phase structure leads to the formation of the mixed phases. Among the individual Bi3+ and V5+ doped GdPO4, the vanadium-doped GdPO4 showed an effective band gap reduction because of the contribution of V3d orbital from dopant element which leads to the color changes. However, vanadium doping drastically reduced the reflectance property of the compound. On the other hand, by bismuth and vanadium co-doping, the band gap was tuned to give a bright yellow color with significant changes in reflectance property. From the prepared compounds, Gd0.9Bi0.1(P0.9V0.1O4) composition showed a hexagonal phase of gadolinium phosphate hydrate with b∗ value of 34.58 and a reflectance value of 72.92 %. The shape of the particles was identified as nanorod by HRTEM analysis with good chemical and thermal stability.
{"title":"NIR reflective yellow pigment derived from gadolinium phosphate by doping bismuth and vanadium","authors":"S. Abima, S. Sumathi","doi":"10.1016/j.optmat.2024.116532","DOIUrl":"10.1016/j.optmat.2024.116532","url":null,"abstract":"<div><div>This paper investigates the novel series of Near-infrared (NIR) reflective pigments with the general formula Gd<sub>1-x</sub>Bi<sub>x</sub>(P<sub>1-y</sub>V<sub>y</sub>O<sub>4</sub>) prepared via the facile hydrothermal method [where, x = y = 0, 0.05, 0.1, 0.2, and 0.5]. The synthesized compounds were examined by XRD, XPS, FTIR, UV–Vis DRS, SEM and TEM characterization techniques. Bismuth, vanadium co-doping in GdPO<sub>4</sub> host lattice unaltered the phase structure up to x = y = 0.1. At higher co-dopant concentrations, the distortion in the phase structure leads to the formation of the mixed phases. Among the individual Bi<sup>3+</sup> and V<sup>5+</sup> doped GdPO<sub>4</sub>, the vanadium-doped GdPO<sub>4</sub> showed an effective band gap reduction because of the contribution of V<sub>3d</sub> orbital from dopant element which leads to the color changes. However, vanadium doping drastically reduced the reflectance property of the compound. On the other hand, by bismuth and vanadium co-doping, the band gap was tuned to give a bright yellow color with significant changes in reflectance property. From the prepared compounds, Gd<sub>0.9</sub>Bi<sub>0.1</sub>(P<sub>0.9</sub>V<sub>0.1</sub>O<sub>4</sub>) composition showed a hexagonal phase of gadolinium phosphate hydrate with b∗ value of 34.58 and a reflectance value of 72.92 %. The shape of the particles was identified as nanorod by HRTEM analysis with good chemical and thermal stability.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116532"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Quantum dots (QDs) are gaining attention as a possible emissive material that might be used in flexible optoelectronic and photonic systems. In the present work, the temperature-dependent photoluminescence (TDPL) property of manganese di-telluride (MnTe2) QDs was investigated. The room-temperature PL is attributed to the abrupt breakage of the large-area MnTe2 nanosheets by ultrasonication, which integrates defect-mediated localized trap states inside the electronic bandgap. As a result, deliberately generated defect states ultimately generate such PL emission of QDs. Density functional theory (DFT) results further validate the experimental interpretations of the origin of TDPL. In addition, through an in-situ liquid diffusion approach, the QDs were also integrated into a NaCl matrix. Due to light scattering properties, the hybrid crystals exhibit fluorescence centres at various excitation wavelengths. These results suggest that these MnTe2 QDs can be used as an effective basis for future flexible optoelectronic applications.
{"title":"Optical properties of MnTe2 few-layer quantum dots","authors":"Gisa Grace Ninan , Meera Varghese , Chinmayee Chowde Gowda , Yatheesharadhya Bylappa , Anish Nag , Manoj Balachandran , Luiz Ribeiro Junior , Raphael Tromer , Douglas Soares Galvao , Chandra Sekhar Tiwary , Partha Kumbhakar","doi":"10.1016/j.optmat.2024.116619","DOIUrl":"10.1016/j.optmat.2024.116619","url":null,"abstract":"<div><div>Quantum dots (QDs) are gaining attention as a possible emissive material that might be used in flexible optoelectronic and photonic systems. In the present work, the temperature-dependent photoluminescence (TDPL) property of manganese di-telluride (MnTe<sub>2</sub>) QDs was investigated. The room-temperature PL is attributed to the abrupt breakage of the large-area MnTe<sub>2</sub> nanosheets by ultrasonication, which integrates defect-mediated localized trap states inside the electronic bandgap. As a result, deliberately generated defect states ultimately generate such PL emission of QDs. Density functional theory (DFT) results further validate the experimental interpretations of the origin of TDPL. In addition, through an <em>in-situ</em> liquid diffusion approach, the QDs were also integrated into a NaCl matrix. Due to light scattering properties, the hybrid crystals exhibit fluorescence centres at various excitation wavelengths. These results suggest that these MnTe<sub>2</sub> QDs can be used as an effective basis for future flexible optoelectronic applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116619"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116445
Muhammed Swalihu P M , Mallikarjun H. Anandalli , Chitra Lekha C S , Karthika S , Nandakumar Kalarikkal
This paper reports the impact of annealing temperature on structural, linear and non-linear optical properties of YCrO3 (YCO), a perovskite belonging to ABO3 rare-earth orthochromates. Nanocrystalline YCO powder is synthesised using the sol-gel method. The detailed characterizations confirmed that the samples annealed at and above 700 °C are pure YCrO3 possessing well-crystallinity and orthorhombic phase. It has been noted that the annealing temperature has a significant impact on various properties of YCO nanomaterials, including particle size, morphology, band gap, non-linear absorption coefficient, and optical limiting. Reddish-orange and red colour emissions were observed for YCO samples from the CIE chromaticity diagram. NLO properties were studied using the Z-scan technique with a pulsed Nd:YAG laser, and observed three photon like nonlinear absorption.
{"title":"Tuning the linear and non-linear optical properties of YCrO3 for optoelectronic applications","authors":"Muhammed Swalihu P M , Mallikarjun H. Anandalli , Chitra Lekha C S , Karthika S , Nandakumar Kalarikkal","doi":"10.1016/j.optmat.2024.116445","DOIUrl":"10.1016/j.optmat.2024.116445","url":null,"abstract":"<div><div>This paper reports the impact of annealing temperature on structural, linear and non-linear optical properties of YCrO<sub>3</sub> (YCO), a perovskite belonging to ABO<sub>3</sub> rare-earth orthochromates. Nanocrystalline YCO powder is synthesised using the sol-gel method. The detailed characterizations confirmed that the samples annealed at and above 700 °C are pure YCrO<sub>3</sub> possessing well-crystallinity and orthorhombic phase. It has been noted that the annealing temperature has a significant impact on various properties of YCO nanomaterials, including particle size, morphology, band gap, non-linear absorption coefficient, and optical limiting. Reddish-orange and red colour emissions were observed for YCO samples from the CIE chromaticity diagram. NLO properties were studied using the Z-scan technique with a pulsed Nd:YAG laser, and observed three photon like nonlinear absorption.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116445"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116510
YingDi Wang , ZhiLin Liu , ZhangSheng Liu , PeiZhong Feng
Constructing heterostructure photocatalyst with intimate contact is an effective strategy to improve the photocatalytic property. Herein, we constructed a novel heterostructure consisting of the same elements via a two-step hydrothermal process. The obtained Cd8.05Zn1.95S10/CdZn19S20 heterostructure exhibited enhanced photocatalytic activity, whose H2 generation rate (6.16 mmol/h/g) was 3.2 and 2.6 times higher than that of CdZn19S20 (1.92 mmol/h/g) and Cd8.05Zn1.95S10 (2.33 mmol/h/g), respectively. In addition, Cd8.05Zn1.95S10/CdZn19S20 also presented excellent photocatalytic activity for methyl orange (MO) degradation, which could remove 95.5 % of MO within 60 min of visible light irradiation. The efficient separation and transfer of photogenerated charge carriers were the main reasons for the enhanced photocatalytic activity, which was confirmed by photoluminescence spectra (PL), transient photocurrent response and electrochemical impedance (EIS). And meanwhile, the possible photocatalytic H2 production mechanism of Cd8.05Zn1.95S10/CdZn19S20 heterostructure was proposed. This work may provide a reference and foundation to design similar heterostructure photocatalysts.
{"title":"Construction of Cd8.05Zn1.95S10/CdZn19S20 heterostructure with the same elements and its photocatalytic performance","authors":"YingDi Wang , ZhiLin Liu , ZhangSheng Liu , PeiZhong Feng","doi":"10.1016/j.optmat.2024.116510","DOIUrl":"10.1016/j.optmat.2024.116510","url":null,"abstract":"<div><div>Constructing heterostructure photocatalyst with intimate contact is an effective strategy to improve the photocatalytic property. Herein, we constructed a novel heterostructure consisting of the same elements via a two-step hydrothermal process. The obtained Cd<sub>8.05</sub>Zn<sub>1.95</sub>S<sub>10</sub>/CdZn<sub>19</sub>S<sub>20</sub> heterostructure exhibited enhanced photocatalytic activity, whose H<sub>2</sub> generation rate (6.16 mmol/h/g) was 3.2 and 2.6 times higher than that of CdZn<sub>19</sub>S<sub>20</sub> (1.92 mmol/h/g) and Cd<sub>8.05</sub>Zn<sub>1.95</sub>S<sub>10</sub> (2.33 mmol/h/g), respectively. In addition, Cd<sub>8.05</sub>Zn<sub>1.95</sub>S<sub>10</sub>/CdZn<sub>19</sub>S<sub>20</sub> also presented excellent photocatalytic activity for methyl orange (MO) degradation, which could remove 95.5 % of MO within 60 min of visible light irradiation. The efficient separation and transfer of photogenerated charge carriers were the main reasons for the enhanced photocatalytic activity, which was confirmed by photoluminescence spectra (PL), transient photocurrent response and electrochemical impedance (EIS). And meanwhile, the possible photocatalytic H<sub>2</sub> production mechanism of Cd<sub>8.05</sub>Zn<sub>1.95</sub>S<sub>10</sub>/CdZn<sub>19</sub>S<sub>20</sub> heterostructure was proposed. This work may provide a reference and foundation to design similar heterostructure photocatalysts.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116510"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116602
M.I. Sayyed , Morad Kh Hamad , M.H.A. Mhareb
This study investigates borosilicate glasses' structural, optical, and ionizing radiation-shielding features when varying percentages of lead oxide (PbO) are introduced. The fabrication process involves the conventional melt-quenching approach. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) explored structural features for all glasses. Meanwhile, the optical properties were assessed based on the absorption edge. The radiation shielding properties were investigated using Phy-x software. The density increased gradually with the addition of PbO contents from 3.797 to 4.857 g/cm3. The FTIR results revealed silicate and borate functional groups, while the XRD confirmed the amorphous nature of all glasses. The band gap was reduced gradually by adding PbO from 4.198 to 3.864 eV. The radiation shielding results revealed enhanced radiation attenuation with increased PbO content, making the glass with 25 mol% PbO appropriate for ionizing radiation protection field. The investigation encompasses diverse energy ranges, from X-ray K-edge to MeV gamma rays, providing a comprehensive understanding of photon interactions with the present glasses. Future medical physics and radiation shielding applications can leverage these insights for material optimization.
{"title":"Radiation shielding properties for a borosilicate glass: Role of varying PbO","authors":"M.I. Sayyed , Morad Kh Hamad , M.H.A. Mhareb","doi":"10.1016/j.optmat.2024.116602","DOIUrl":"10.1016/j.optmat.2024.116602","url":null,"abstract":"<div><div>This study investigates borosilicate glasses' structural, optical, and ionizing radiation-shielding features when varying percentages of lead oxide (PbO) are introduced. The fabrication process involves the conventional melt-quenching approach. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) explored structural features for all glasses. Meanwhile, the optical properties were assessed based on the absorption edge. The radiation shielding properties were investigated using Phy-x software. The density increased gradually with the addition of PbO contents from 3.797 to 4.857 g/cm<sup>3</sup>. The FTIR results revealed silicate and borate functional groups, while the XRD confirmed the amorphous nature of all glasses. The band gap was reduced gradually by adding PbO from 4.198 to 3.864 eV. The radiation shielding results revealed enhanced radiation attenuation with increased PbO content, making the glass with 25 mol% PbO appropriate for ionizing radiation protection field. The investigation encompasses diverse energy ranges, from X-ray K-edge to MeV gamma rays, providing a comprehensive understanding of photon interactions with the present glasses. Future medical physics and radiation shielding applications can leverage these insights for material optimization.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116602"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116595
Suleman Modu Ngaram , Suhairul Hashim , Mohamad Syazwan Mohd Sanusi , Abdullahi Ibrahim , M.I. Sayyed
This work investigates the physical and radiation protective features of synthetic glasses with the chemical compositions (70-x) B2O3–5TeO2–10Bi2O3–10SrCO3–5K2CO3-xEr2O3 (where x = 0.5, 0.7, 0.9, 1.1, and 1.3 mol%). The density of the produced glasses increased from 3.692 to 3.888 g cm−3, while the molar volume decreased from 34.302 to 32.421 cm3 mol−1 in response to the addition of Er3+ from 0.5 to 1.3 mol%. The oxygen molar volume (OMV) declined from 11.561 to 11.179 cm3 mol−1, and the figures for oxygen packing density (OPD) increased from 86.012 to 88.823 g atm l−1. The linear attenuation coefficient (LAC) was measured experimentally using narrow beam transmission geometry and validated with XCOM software across an energy range of 0.059–1.333 MeV. The experimental and theoretical results demonstrated significant agreement. The LAC values decreased with increasing photon energy, ranging from 9.725 to 0.202 cm−1 for BTEr0.5, 10.251 to 0.207 cm−1 for BTEr0.7, 10.481 to 0.208 cm−1 for BTEr0.9, 10.948 to 0.211 cm−1 for BTEr1.1, and 11.233 to 0.213 cm−1 for BTEr1.3 glass samples, indicating superior protection against lower-energy photons. Additionally, the HVL and MFP values for the BTEr1.3 sample increased from 0.062 to 3.254 cm and 0.089–4.695 cm, respectively, highlighting that the sample with 1.3 mol% Er2O3 is particularly promising for radiation shielding applications.
{"title":"Optimized physical and radiation attenuation properties of Er3+-Doped strontium potassium bismuth-boro-tellurite glass systems: An experimental study","authors":"Suleman Modu Ngaram , Suhairul Hashim , Mohamad Syazwan Mohd Sanusi , Abdullahi Ibrahim , M.I. Sayyed","doi":"10.1016/j.optmat.2024.116595","DOIUrl":"10.1016/j.optmat.2024.116595","url":null,"abstract":"<div><div>This work investigates the physical and radiation protective features of synthetic glasses with the chemical compositions (70-x) B<sub>2</sub>O<sub>3</sub>–5TeO<sub>2</sub>–10Bi<sub>2</sub>O<sub>3</sub>–10SrCO<sub>3</sub>–5K<sub>2</sub>CO<sub>3</sub>-xEr<sub>2</sub>O<sub>3</sub> (where x = 0.5, 0.7, 0.9, 1.1, and 1.3 mol%). The density of the produced glasses increased from 3.692 to 3.888 g cm<sup>−3</sup>, while the molar volume decreased from 34.302 to 32.421 cm<sup>3</sup> mol<sup>−1</sup> in response to the addition of Er<sup>3+</sup> from 0.5 to 1.3 mol%. The oxygen molar volume (OMV) declined from 11.561 to 11.179 cm<sup>3</sup> mol<sup>−1</sup>, and the figures for oxygen packing density (OPD) increased from 86.012 to 88.823 g atm l<sup>−1</sup>. The linear attenuation coefficient (LAC) was measured experimentally using narrow beam transmission geometry and validated with XCOM software across an energy range of 0.059–1.333 MeV. The experimental and theoretical results demonstrated significant agreement. The LAC values decreased with increasing photon energy, ranging from 9.725 to 0.202 cm<sup>−1</sup> for BTEr0.5, 10.251 to 0.207 cm<sup>−1</sup> for BTEr0.7, 10.481 to 0.208 cm<sup>−1</sup> for BTEr0.9, 10.948 to 0.211 cm<sup>−1</sup> for BTEr1.1, and 11.233 to 0.213 cm<sup>−1</sup> for BTEr1.3 glass samples, indicating superior protection against lower-energy photons. Additionally, the HVL and MFP values for the BTEr1.3 sample increased from 0.062 to 3.254 cm and 0.089–4.695 cm, respectively, highlighting that the sample with 1.3 mol% Er<sub>2</sub>O<sub>3</sub> is particularly promising for radiation shielding applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116595"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116562
Lia Mara Marcondes , Juliane Resges Orives , Lucas Konaka Nolasco , Sabrina N.C. Santos , Cleber Renato Mendonça , Thierry Cardinal , Yannick Petit , Lionel Canioni , Marc Dussauze , Marcelo Nalin
Three-dimensional (3D) microstructures were written by femtosecond (fs) laser aiming to manufacture waveguides inside niobium germanate glasses. The laser-induced damage threshold using 1030 nm fs-laser irradiation was investigated, and the waveguides were written in different fluences. The morphology, structural information and refractive index changes of microstructures were discussed. The waveguide cross-section microscopy data shows an elliptical shape with a diameter varying with the applied pulse energy. The micro-Raman maps demonstrate the occurrence of structural modifications with different microregions along the laser propagation direction. The refractive index profiles point to the formation of at least one microregion containing a positive refractive index change along the laser propagation. Guided light transmission measurements demonstrate the formation of single-mode waveguides inscribed at low pulse energy (up to 132 nJ) and an emitting waveguide in the rare-earth-doped sample. The visible luminescent response of erbium ions in the waveguide output was demonstrated and supports the possibility of using these core waveguides for future 3D multi-functional photonic devices operating in the visible region.
{"title":"3D luminescent waveguides micromachining by femtosecond laser inscription in niobium germanate glass","authors":"Lia Mara Marcondes , Juliane Resges Orives , Lucas Konaka Nolasco , Sabrina N.C. Santos , Cleber Renato Mendonça , Thierry Cardinal , Yannick Petit , Lionel Canioni , Marc Dussauze , Marcelo Nalin","doi":"10.1016/j.optmat.2024.116562","DOIUrl":"10.1016/j.optmat.2024.116562","url":null,"abstract":"<div><div>Three-dimensional (3D) microstructures were written by femtosecond (fs) laser aiming to manufacture waveguides inside niobium germanate glasses. The laser-induced damage threshold using 1030 nm fs-laser irradiation was investigated, and the waveguides were written in different fluences. The morphology, structural information and refractive index changes of microstructures were discussed. The waveguide cross-section microscopy data shows an elliptical shape with a diameter varying with the applied pulse energy. The micro-Raman maps demonstrate the occurrence of structural modifications with different microregions along the laser propagation direction. The refractive index profiles point to the formation of at least one microregion containing a positive refractive index change along the laser propagation. Guided light transmission measurements demonstrate the formation of single-mode waveguides inscribed at low pulse energy (up to 132 nJ) and an emitting waveguide in the rare-earth-doped sample. The visible luminescent response of erbium ions in the waveguide output was demonstrated and supports the possibility of using these core waveguides for future 3D multi-functional photonic devices operating in the visible region.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116562"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.optmat.2024.116560
Jiaqi Tang, Chang-Kui Duan
In this work, we use first-principles calculation based on density functional theory (DFT) to investigate the band structure and optical properties of the wide-bandgap spinel oxide MgGa2O4 doped by transition metal (TM) ions. MgGa2O4 possesses a nearly inverse spinel structure, making it a representative material for disordered systems. To obtain a reasonable disordered crystal structure of the host material, we create a special supercell generated by the special quasirandom structure method. In the band structure calculations, the PBE0-α hybrid functional is employed to obtain an accurate bandgap value, which aligns well with experimental data. Additionally, we calculate the charge transition levels (CTLs) of TM ions doped in MgGa2O4. The CTLs of Tm ions at different sites are calculated to account for the influence of disordered structures. Using the zigzag model, we can estimate the impact of disordered structures and analyze the range of CTLs for TM doping in different environments, which offer insights into explaining the experimental spectra. This work demonstrates the effectiveness of the zigzag model to infer the optical properties of disordered materials. Furthermore, it deepens our understanding of the luminescence mechanism in TM-doped MgGa2O4, providing valuable insights for predicting and designing new materials.
{"title":"First-principles study on defect levels of transition metal ions in near-inverse MgGa2O4","authors":"Jiaqi Tang, Chang-Kui Duan","doi":"10.1016/j.optmat.2024.116560","DOIUrl":"10.1016/j.optmat.2024.116560","url":null,"abstract":"<div><div>In this work, we use first-principles calculation based on density functional theory (DFT) to investigate the band structure and optical properties of the wide-bandgap spinel oxide MgGa<sub>2</sub>O<sub>4</sub> doped by transition metal (TM) ions. MgGa<sub>2</sub>O<sub>4</sub> possesses a nearly inverse spinel structure, making it a representative material for disordered systems. To obtain a reasonable disordered crystal structure of the host material, we create a special supercell generated by the special quasirandom structure method. In the band structure calculations, the PBE0-α hybrid functional is employed to obtain an accurate bandgap value, which aligns well with experimental data. Additionally, we calculate the charge transition levels (CTLs) of TM ions doped in MgGa<sub>2</sub>O<sub>4</sub>. The CTLs of Tm ions at different sites are calculated to account for the influence of disordered structures. Using the zigzag model, we can estimate the impact of disordered structures and analyze the range of CTLs for TM doping in different environments, which offer insights into explaining the experimental spectra. This work demonstrates the effectiveness of the zigzag model to infer the optical properties of disordered materials. Furthermore, it deepens our understanding of the luminescence mechanism in TM-doped MgGa<sub>2</sub>O<sub>4</sub>, providing valuable insights for predicting and designing new materials.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"159 ","pages":"Article 116560"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号